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DC Motor fault diagnosis
Fault Probable cause
Correctives
Large spark
Small brush contact surface Grind brush
Over brush wear Replace new brush
Oil stain on commutator surface Clean commutator surface
Commutator decentration or commutator
segment extrusion
Process commutator outer circle
Motor overload Motor overload
Large mechanical vibration Eliminate vibration source
The welding of armature coils is not good
or open weld
Repair welding
Short circuit armature coils or
commutator segment
Eliminate short circuit.
Abnormal
speed
Large loading moment Reduce loading moment
Brush is not in neutral position Adjust brush to neutral position
Coil overheat
Overload run Reduce overload
Armature coils short circuit
Eliminate short circuit and
reinforce insulation
Large vibration
Basis unstable or motor fixed on the
basis unstable
Reinforce basis firmness and fix
the motor.
Decentraction of axis Adjust concentricity
Armature imbalance Re-adjust armature balance
Overload or overspeed
Reduce loading moment or
reduce speed
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